The function is .

Fundamental theorem of calculus :

If  is continuous on , then the function  is defined by  is continuous on  and differentiable on , then .

Here .

.

.

Find the critical points by equating .

.

Critcal points are  and .

The test intervals are ,  and .

\ Interval \	Test Value	Sign of	Conclusion
			Decreasing
			\ Increasing \
			Decreasing

The function is increasing on the interval .

The function is increasing on the interval .